Chapter nine provides a valuable recapitulation of the material already presented.

　　第9章對已經陳述過的材料進行了有價值的概括。

　　Many of our teachers also have valuable academic links with Heidelberg University.

　　我們的許多教師也和海德堡大學保持著有價值的學術聯系。

　　The company does not accept liability for fragile, valuable or perishable articles.

　　公司對于易碎、貴重或易腐爛的物品不負責任。